%0 Journal Article %A V. G. Michalev %T Differential-geometrical structures in the theory of two-dimensional integrable equations %J Zapiski Nauchnykh Seminarov POMI %D 1991 %P 75-81 %V 189 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1991_189_a5/ %G ru %F ZNSL_1991_189_a5